van emon



PATENTED MAR. 12, 1867.

s. V'AN EMON., H'OISTING MACHINE.

|s PETERS co mmouwo nites greet. strut-t ffirr SA M'UEL VANQEMON, or GIN CIN-NA-TIL OHIO.

towers-Patent No. 62,788, dated March 12, 1867. i

IMPROVEMENT, IN sors'rme MACHINE.

TO ALL WHOM IT MAY'CONGERN:

Be it known that I, SAMUEL VAN EMON, of CineinnatiQHarhilton county, andState of Ohio, have inventedcertain new and useful Improvements in Hoisting Machines; end I do hereby declare the following tobe a full,

clear, and exact description thereof, reference being had to the accompanying drawings, making part of this specification.

My invention consists in jo'urnalling within the hoisting platform a screw or worm of nearly the same size as the hatohways, the worm being so that its throads'or flanges may rest on or revolve over a line or series of rollers, or their equivalents, et'suitnble intervals, in two or more fixed vertical st anchions. In the accompanying drawings I Figure 1 is a perspective view of the preferred construction of my hoisting apparatus.

Figure 2 is a vertical section of the same; and

Figure 3 is a. perspective view of a roller-frame, devised as an anti-friction medium between the weighted platform and the propelling-worm. v

The'platform-freme, composed as shown, of floors A A and posts B, is provided with boxes 0 G, in jwhioh is vertically journslled the'propelling-worm or screw D, which is adapted to revolve ifreely within the frame,

To diminish friction, I journal onthe shaft of the screw D, between the floor A of'the platform-frame and the face of the worm, an anti-friction roller-frame, composed, asshown in fig. 3, ofnfring, E, box F, arms G, and rollers H; the rollers bearing-when in position, on the face d of. the worm, and o'n'the plated bottom a of the floor A. As a. modification of this device','the rollers may be journalled in fixed boxes on the under side of the floor A, and bear on the face of the worm: "The worm D is "a more shell or drum, constructed in-the' lightest possible form. compatible: with the requisite strength; the spiral being simply an angle-iron flange d riveted to the periphery of the drum; The angle-iron spiral flange finds abearing, at opposite sides, on two or more vertical flights or series of rollers, I, made fast on spindles '2', which, revolving with the rollers, are journ alled horizontally in vertical stanchions the stanchions being secured to the sides of the hatohways, and provided throughout their entire" length with said rollers, at inter-vols corresponding exactly with the pitch of the spiral. The roller-spindles z .inayjbe j'ournalled in babbitt-metal boxes firmly embedded in the stenchionsi The rollers receive the weight in regular succession in hoisting andlowering: The worm D may be operated by the well-known bolt apd pulley-device, K L M, connected with the pinion N-and toothed face 0 of the worm. In cases where the pitch ofthe wornTYD is so greatthat the platform, in the event of the belt K breaking, would run down under a heavy load, I have devisedthe following'safety apparatus: The pulley M is journalledto a frame, P, capable of vertical motion in the,slots'p, and carryinr 'a weightedbrake, Q, adapted to rub on the.

pulley L when the frame I? is not sustained by the tension of the belt on pulley M. In the event of the acci dental breaking of the belt, the brake Q falls on the pulley L and prevents, by excessive friction, the revolution of the worm D, and.the consequent running down of the platform; In the construction of the worm D and stanchioiis J, I do' not desire to restrict mys'elf'to the precise form described, as the worm-D may have one or more'spirals which may be cast in one piece with the drum, while the rollers I may revolve onstuds projecting rigidly from the stanchions, or the stsnchions maybe provided with common worm racks; but in this case the friction would been great that its operation would be almost impracticable; moreover, three or more equidistaut flights of stanchions snd'rollers may be employed. i v

I claim herein as new and of my invention- 1. An elevator-platform, provided with a spiral drum or worm, D, in combination with two or more vertical flights of rollers I, arranged and operated as set forth.

2. The provision of the anti-friction roller-frame F GH, for the purpose specified. Y J L, 3. The gravitating pulley-frame P and'brake Q, operated in the manner and for the purpose specified. In testimony of which invention I hereunto set my hand.

SAMUEL VAN EMo'N.

Witnesses;

JAMES H. 'L YMAN, Geo. I-I. KNIGHT. 

